feat: Network MCP Server v0.1.0 — SNMP backend with 5 tools

MVP with zero-dependency SNMP backend for AI-powered network management:
- get_snmp_value: query single OID
- walk_snmp_tree: walk OID subtree
- get_device_info: vendor auto-detection, uptime, location
- get_interfaces: interface status with human-readable output
- discover_devices: subnet SNMP discovery

Tech: FastMCP + pysnmp-lextudio, Python 3.10+
Works with: Cisco, Juniper, Arista, UniFi, Fortinet, and any SNMP device
23 tests passing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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